Micro speaker

Abstract

Disclosed is a micro speaker, comprising a vibration system, a magnetic circuit system and a support system; the vibration system comprises a vibrating diaphragm; a dodging groove is provided on a dome portion of the vibrating diaphragm opposite to a groove structure of an upper housing; the depth of the dodging groove is not less than that of the groove structure; an orthographic projection area of the dodging groove covers that of the groove structure; a dodging structure is provided on a washer of the magnetic circuit system opposite to the dodging groove; the depth of the dodging structure is not less than that of the dodging groove; and the orthographic projection area of the dodging structure covers that of the dodging groove. This structure ensures the normal operation of a product and acoustic performance of a micro speaker while preventing collision of components.

The invention claimed is: 
     
       1. A micro speaker, comprising a vibration system, a magnetic circuit system and a support system for accommodating and fixing the vibration system and the magnetic circuit system, wherein the vibration system comprises a vibrating diaphragm and a voice coil bonded to one side of the vibrating diaphragm, and the vibrating diaphragm comprises a rigid dome portion located at a central position and a suspension ring portion located at an edge position; the magnetic circuit system comprises a washer, a magnet and a magnetic yoke which are sequentially combined together, and a magnetic gap for accommodating the voice coil is formed in the magnetic circuit system; the support system comprises an upper housing; and the upper housing is provided with a recessed groove structure at a position corresponding to the dome portion of the vibrating diaphragm, wherein
 the dome portion is provided with a dodging groove at a position opposite to the groove structure of the upper housing; a vertical depth of the dodging groove is not less than a depth of the groove structure of the upper housing; and an orthographic projection area of the dodging groove covers an orthographic projection area of the groove structure of the upper housing; 
 the washer is provided with a dodging structure opposite to the dodging groove of the vibrating diaphragm; a vertical depth of the dodging structure is not less than the depth of the dodging groove; and an orthographic projection area of the dodging structure covers the orthographic projection area of the dodging groove of the vibrating diaphragm. 
 
     
     
       2. The micro speaker according to  claim 1 , wherein a thickness of the washer is not less than the vertical depth of the dodging groove of the vibrating diaphragm;
 the washer opposite to the vibrating diaphragm is a hollow annular structure, the dodging structure of the washer is a hollow portion of the washer, and an orthographic projection area of the hollow portion of the washer overlaps with the orthographic projection area of the dodging groove of the vibrating diaphragm. 
 
     
     
       3. The micro speaker according to  claim 1 , wherein the magnetic circuit system is a dual magnetic circuit structure that comprises a center washer and a center magnet which are bonded to a central position of the magnetic yoke, and an edge washer and an edge magnet which are bonded to an edge position of the magnetic yoke; wherein the center washer is provided at a position opposite to the dome portion of the vibrating diaphragm. 
     
     
       4. The micro speaker according to  claim 3 , wherein a thickness of the center washer is not less than the vertical depth of the dodging groove of the vibrating diaphragm;
 the center washer is a hollow annular structure, and a hollow portion of the center washer is provided at a position opposite to the dodging groove of the vibrating diaphragm, and an orthographic projection area of the hollow portion of the washer overlaps with the orthographic projection area of the dodging groove of the vibrating diaphragm. 
 
     
     
       5. The micro speaker according to  claim 3 , wherein the center washer is a hollow annular structure, the center magnet is also a hollow annular structure, and an orthographic projection area of a hollow portion of the center magnet overlaps with an orthographic projection area of a hollow portion of the center washer. 
     
     
       6. The micro speaker according to  claim 1 , wherein the vertical depth of the dodging groove of the vibrating diaphragm is equal to the vertical depth of the groove structure of the upper housing. 
     
     
       7. The micro speaker according to  claim 1 , wherein each of the groove structure of the upper housing and the dodging groove of the vibrating diaphragm is provided with a transition slope, and the transition slope of the groove structure is parallel to the transition slope of the dodging groove. 
     
     
       8. The micro speaker according to  claim 3 , wherein each of the dodging groove of the vibrating diaphragm and an inner edge of the center washer is provided with a transition slope, and the transition slope of the dodging groove is parallel to the transition slope of the inner edge of the center washer. 
     
     
       9. The micro speaker according to  claim 1 , wherein the support system further comprises a middle housing and a lower housing, and the middle housing and the lower housing support and fix the magnetic circuit system. 
     
     
       10. The micro speaker according to  claim 1 , wherein the upper housing comprises a plastic holder and a steel sheet which is coupled with the plastic holder through injection molding;
 a sound hole of the micro speaker is located at a lateral side of the micro speaker, and is provided on a side wall of the upper housing.